Refinancing

Anyone have ideas of who to go to for a refinance on a loan that's over $425k but under $617 or whatever the new jumbo threshold is? We bought an apartment in a four apartment co-op in Brooklyn a year ago and Wells Fargo (our lender) is refusing to refinance, saying that they can't lend to an apartment in a four-apartment co-op. Apparently last year they got a waiver but now they say that won't happen. The whole thing is a bit confusing since it's not clear whether they hold the mortgage or they sold it to Fannie or Freddie or whatever. Just want to take advantage of rates that are 150 bps below what I'm paying now, but am having trouble. Anybody else have similar issues?